NDLI: Non-convergent ordering and displacive phase transition in pigeonite: in situ HT XRD study

Content Provider	Springer Nature Link
Author	Cámara, F. Carpenter, M. A. Domeneghetti, M. C. Tazzoli, V.
Copyright Year	2002
Abstract	A natural Ca-rich pigeonite (En47Fs43Wo10), free of augite exsolution products, was studied by in situ high-temperature single-crystal X-ray diffraction. The sample, monoclinic P2 1 /c (a=9.719(7) Å, b=8.947(9) Å, c=5.251(3) Å, β=108.49(5), V=433.0(6) Å3), was annealed up to 1000 °C to induce a phase transition from P2 1 /c to C2/c symmetry. Complete single-crystal X-ray diffraction data collections were carried out in situ at 650, 750, 850 and 950 °C after the crystal had reached equilibrium for the Fe–Mg intracrystalline exchange reaction at each temperature. The variation, with increasing temperature, of lattice parameters, of intensity of hkl reflections with h + k=2n + 1 (which vanish at high temperature) and of some geometrical parameters from structure refinement, showed that the displacive phase transition P2 1 /c⇆C2/c was continuous in character. This contrasts with the first-order character for the HT phase transition in pigeonite containing significantly less calcium.
Starting Page	331
Ending Page	340
Page Count	10
File Format	PDF
ISSN	03421791
Journal	Physics and Chemistry of Minerals
Volume Number	29
Issue Number	5
e-ISSN	14322021
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-06-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Materials Science

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